Rugby Club Los Matreros, simply known as Los Matreros, is an Argentine rugby union and field hockey club sited in Castelar, a city of Morón Partido in Greater Buenos Aires.

The club's name was chosen as a tribute to the Martín Fierro, the most renowned poem of the "Gauchesco" literature in Argentina.

Martín Fierro (the character) is described by the author, José Hernández as a "matrero" ("smart", "clever" in English) gaucho.

The election of the club name is also related to the place where it was founded: Morón (today a populous city of the Greater Buenos Aires) was an uninhabited land by the time and some battles for the independence had been fought there in the past.

[2] In 2011 Los Matreros was relegated to second division after finishing 11th in Zona Reubicación.